import requests
from bs4 import BeautifulSoup
import bs4
'''
获取网页
'''
def getHTMLText(url):
    try:
        r = requests.get(url,timeout = 30)
        r.raise_for_status()
        r.encoding = r.apparent_encoding
        return r.text
    except:
        print("获取网页错误")
        return ""

def fillUnivList(ulist,html):
    soup = BeautifulSoup(html,"html.parser")#使用html.parser解释器
    for tr in soup.find('tbody').children:
        if isinstance(tr,bs4.element.Tag):
            tds = tr('td')
            ulist.append([tds[0].string,tds[1].string,tds[2].string,tds[3].string])
    return ulist

def printUnivList(ulist,num):
    tplist = "{0:^10}\t {1:{3}^10}\t {2:^10}"
    print(tplist.format("排名","学校名称","总分",chr(12288)))
    for i in range(num):
        u = ulist[i]
        print(tplist.format(u[0],u[1],u[3],chr(12288)))
    

def main():
    uinfo = []
    url = 'http://zuihaodaxue.cn/zuihaodaxuepaiming2018.html'
    html = getHTMLText(url)
    fillUnivList(uinfo, html)
    printUnivList(uinfo,20)

main()